US1507948A - Triple-cushioned valve - Google Patents

Description

Sept. 9 1924. 1,507,948

E. V. ANDERSON TRIPLE CUSHIDNED VALVE' Original Filed July 6, 1917 7 Q2) :15.4. 25133 7 2? /9 U8) 33 8 2 .//6 2/7 $526 We) n (a7) 5 4/ s 42 379 l a /m/EA/TQ w/r/vsssss M GMM/M Patented Sept. 9, 1924 UNITED N STATES EDWARD v. ANDERSON, or MoNEssEN, PENNSYLVANIA, AssiGNoE or ONE-HALF 'ror` l CHARLES E GOLDEN, or' GRAFTON, PENNSYLVANIA.

PATENT or-frilcs. f

TRIPLE-CUSHIONED VALVE.

Original application filed July `6,1917, Serial No. 179,009. Patent No. 1,370,260, dated March 1,- 192i.l

Divided` and this application filed April 12, 1920.* Serial No. 373,145.

To all whom t may concern: l

Be it known that I, EDWARD V. `ANDERsoN,

a resident of Monessen, in the county of Westmoreland and Statev of Pennsylvania, have invented Aa new and useful Improvement in Triple-Cushioned Valves, of which the following is a specification.

This invention relates to valve mechansms for controlling a flow of fluid under` pressure, such as steam.l More particularly it relates to sucha valve adapted to be automatically opened and held normally in that position by pressure ofthe fluid, but to be automatically closed in case of sudden reduction of pressure on either side of the valve.

The particular improvements of the present invention consists in providing an addi-v tional cushioning means for such valve, and,v

in providing means for o erating-the valve in bothdirections by han meansl for locking itin either open or closed position,'thev tions of the hand operating mechanism w len` the valve is locked in closedV position so that it cannot be automatically operated; Fig. 3 is a view similar to Fig. 2, showing the position of certain part-s as when the valve is 'locked-in open position; and Fig. 4 is a partial section similar to Fig. l, but showing a modified form of the cushioning means.

Valves `of the type illustrated are employed on the tops of boilers, in steam mains, and other places where fluid is passed in one direction, under high pressure. Such valves are frequently subjected -to a considerable and sudden variation 1n pressure, as for eX- ample where several 'engmesaredriven byk steam from a single main, and such engines becomesynchronized.V There is aresulting pulse inthe supply pipe which" tends 'toy throw an automatic valve to its seat, or else cause it to pulsate with the variation in pres` sure. In order to meet such conditions it is necessary to have the valve very strong,andv have it ythoroughly cushioned, in orderv to. prevent it from chattering and to preventitv from violently. and suddenly opening.. vor closing. ySuch action will destroy even the strongest valves. The 'present construction provides a supplementary cushioningvchamber arranged in the valve casing on the. out-rv let side of the valve. This comprises-a Wall enclosing the rear of the valve and moving with it, and a suitable cooperating member carried by the casing and adapted to form a dash-pot or chamber with the lsaid Wall;

The wall shields'thefrear side ofthe valve from the. destructivel pulsations sometimes found in steam mains andthe like, and ensures that thevalve will not be hammered by the pulsations of back pressure even der the` most severe conditions.

The structure illustrated 'belongs to l,the

class of triple-.acting non-return valves such as that illustrated in my prior- Patentk #1,209,7' 95, and the general type of valves is well known in the art. By triple-acting7V the art has come to understand a'mainvalve that will close when the source of pressure" yso d fails, or when there is a failure o-f-back pre'si sure in the linebeyondA the valve, and which may also -be closed by hand v'regardless of,

pressure on either side.

the fluid inlet chamberl and they outlet chamber (4). The 'artition has a central opening in which is tt'ed a valve seat member-2a, and theopening is closed vby a main valve 5 supported on a vertically movable stem 6 lwhich also'carries `a double piston? member 7, adapted to reciproca-tem ajcyL inder 8, fixed in the main casing',A -The cas'- ing is covered by a hood 9 through which Referring to the drawings, vthema-in casev ing l has a valve seat partition 2 separating v `member 13., carried by a rigid extension 14 from the bore 15 to the bottom of the stem and forming v a continuous passage therethrough. In the larger bore is a ball check 17 adapted to prevent the passage of luid downward through the stem, but to allow it to pass freely upward. By this means pressure can readily pass trom the chamber (3) through the stem 6 into a chamber (18) formed byV a bore in an upward central eX- tension ot the piston member 7, and from that chamber through a port 19 into a. chamber (29), bounded by the piston member 7, the c lin'der 8, and the hood 9. From this cham er (20) pressure can pass by means of small port 21 to thelower side of piston member?, into chamber (22), and thence by leakage into chamber (23), formed by the lowerside of piston member 7, and partition'vvall 24 extending inward from a cylindrica-l portion 25 of the casting forming the cylinder 8, above referred to, This member 24 Vhas a central downward extension 26, having a central bore forming a guide bearing for the valve stem 6. A suitable packing'2T is. provided for the reciprocating piston 7 so that the only escape of pressure from the chamber (20) tothe chamber isby port 21.

4cap 28 isV threaded Von the exterior ot extensionv 29 of piston member 7, and this cap" extends inwardly beyond the central bore of said extension 29, having a central bore through which the screw stem 10 passes but forming a shoulder adapted to engage a collar 30`on the lower end ot the screw stem 10 and to limit the upward travel oi such screw stem by such abutment. The collar 30 engages at the lower end of the chamber (18) another Shoulder 31, on the extension 29. This construction allows the Collar 30 to be moved up and down the length of the'chamber r(13) without ellect on the main valve, but at the ends ol; such idle movement will operate to either open or close the main valve, as the stem may be moved up or down, in obvious manner,

In the view shown in Fig, 1, the main valve is open, the hand wheel and stem 10 being positioned to 'permit the main valve tofbe opened or closed automatically. the hand wheel be moved upward still 'tarther, it will carry the main valve and hold it'there without possibility ot its being closed A automatically, until the hand wheel is again turned down,

1f, on the other hand, the hand wheel be turned d own until the vcollar 30 drives the valve into closed position, it will be locked there, not subject to automatic operation, until the hand wheel is again moved up to some such position as that illustrated in Fig. 1.

In Figs. 2 and 3 details are shown of a latch adapted to determine the proper'travel ot the valve stem for the various positions described. to the trame and normally hangs as shown in F ig. 1, with a shoulder across the path of travel of the unthreaded portion of the stem 10, which forms a shoulder 105 at ythe junction between it andthe portion 1 1. When the stem is moved up byhand wheel 12 the shoulder 10a will be caught by the latch at the point indica-ted in' Fig, 1, and further upward travel of the stem prevented. This is'the proper position tor the Vhand wheel and stem when it is desired to leave the valve subject to automatic opening and closing. By releasing the latch as shown in F ig. 3, the stem maybe turned on up to the position shown in that figure, where the shoulderl 10a will be in abutment with shoulder 13il on collar 13, and the valve will be locked in open position sothat it cannot be closed automatica-lly.'Y The stop for the hand wheel when the main valve is locked in closed` position, is ofcourse, when the valve is driven to its seat, and the collar 30 seats on the shoulder 31.

VJ'ith this explanation of the manual opto permit the fluid to pass through the main casing. This pressure also passes upward through the hollow stem by passage 16, and above the piston T, In normal operation this pressure passes through port 31 into chamberV (20) and then by port 21 into chamber (22),

and by leakage from tliat'ohamber into chanr' ber (23), so that pressure on the two sides of the piston member 'l' fis normally equalized. In this position the valve is kept open by pressure of fluid beneath the main valve.

From the chamber (22)' a port 33 leads through a pilot valve, which is not shown',

to the fluid supply main beyond the main valve; l pilot valve suitable for use with this valve is known, asl for example that illustrated and described Vin my` p rior Patent #1,209,795, or in my vPatent No. 1,370,2 l,f`

ot' which this case'is a division,

llt is sutlicient to say that such pilot; valves are adapted ,to release 'pressure from. the chamber (22) by meanS'Qf port 33, when pressure in the steam main is reduced below a predetermined point. When the back pressurein chamber (22) is removed, the pressure in chamber (20) from the supply side of the main valve, will force the valve down upon its seat, and keep it closed so long as the pilot valve prevents the equalization of pressure in chamber 22. Y

It will be seen thatby this construction the main valve is cushioned in its movement in both directions by the trapped fluid in chambers (22) and (23). In the present construction an additional cushioning chamber'is provided by means of a depending cylinder 34, affixed to the partition memberV 24. A cooperating' cylinder 35 is carried on the top of the valve member. A port 36 leads through the cylinder 35, and furnishes a means for escape and kentrance of fluid to the chamber (37) formed by the inter-fitting cylinders 34 and 35, and the partition 24 and valve 5. This makes an additional cushioning dash pot, to further prevent the violent opening or closing, or chattering of the main valve. The cylinders 34 and 35 completely protect the rear side of the valve as against the pulsationsvin the line, and so keep-the main valve from being hammered to its seat or destroyed by such excessive conditions as are frequently met with. Its operation and advantages are apparent. y

In Fig. 4 a 4modification is shown in that the extension 26a of partition vmember 24 vcarries a web` 40, which has a peripheral cylindrical flange 41, adapted to cooperate' with an upwardly eX- tending cylindrical Wall 42 mounted on the upper side of the main valve 5a. A ort 36El is provided through the Wall 42. The valve stem 6a operates in the extension 26, andthe remaining parts of the valve are the same as those described in reference to Fig. l. This also produces a dash ypot chamber (37a), and has a cushioning effect on the movement of the valve similar to that of the dash pot arrangement shown in Fig. l. Three or more guides 43'are provided on force and guide the movement of the main valve.

This additional dash pot 37, or 37a, has the important function of protecting the rear of the valve from sudden changes of pressure that would otherwise exert a sudden and hammer-like blow on the rear of the valve. This is especially true Where there is a sudden back pressure, in pulsations. Thus the construction which forms the cushioning chamber 37 serves as an effective cushion, a reinforcing guidebearing, and as a protective shield for the rear of the valve.

I claim y l. A valve mechanism comprising a casing having a passage therethrough, a valve drical member, a peripheral integral flange extend-` 2. An automatic valvev mechanism com-- prising a casing, a vpassage-therethrough, a

valve controlling the passage, a stem carry-y ing they valve, a peripheral vvall surrounding the rear side of the valve and its stem and adjacent the seating surface ofthe valve, and a Wall `liXed on a partition in the casing slidably interitting with the wall on the valve, whereby to shield the valve from pulsations on the side having said peripheral wall and to form a cushioning chamber be hind the valve.

3. A valve mechanism comprising a casing having la fluid passage'therethrouglna valve i mounted to control said passage and adapted to seat by movement in a direction opposed to that of normal flow of fluid through I the passage, a partitioning member fixed in the valve casing and having a guide opening, the valve being mounted on a stem eX- tending through said guide opening,

skirt carried by said partitioning ing fromV the rear lside of the valve and slidably` interfitting with the said skirt,- whereby the rear of the valve is screened pulsations on the outlet sidey from pressure of the valve.

, 4. An automatic `valve mechanism comf i prising a casing, a passage therethrough, a

valve controlling the passage and adapted to seat against normal How of fluid therethrough, a` guide stem carrying the valve, a partition in the casing forming a bearing for'the guide stem, and a dash-pot for cushioning the movement of the valve compris-A ing a cylindrical member carried by and a cylinsurrounding the rear of the valve, a cooper- V ating member carried by the partition, the two members interittlng to form a screenving dash-pot immediately behindV the valve. the valve seat member 2a, to further reinerated member in position to leave the valve free to be operated automatically.

6. A valve adapted to control passage of fluid from a source of pressure to an outlet main, said valve comprising a casing having a diaphragm dividing it into an inlet and an outlet chamber, and having a port therethrough, a valve positioned in the outlet- Chamb@ of the. easing and adapted to clase the porty a valve stem caryng sind valve, a wall meinbe clQsed at one end and fixed in the casing, said closed' end having a guide opening 01n said' stem, 1n-integral peripheral fiange surrounding the rear of the valve `and shdaby assoclatec' Wlth the other end of saldi Walk member, Wheneby the rem' of the Valve. is screened imm Huid' pulsationsl in the onle clalnbn of the Valye casing'.

In testimony WhereQf, I have hereunb set my hand. Y

' EDWARD Witnesses:

J HOWARD KELLY, ALFRED TANZER.

V. ANDERSON;

Images